Seed Plates For Allis Chalmers Corn Planter

I picked up a one row Allis Chalmers corn planter off of ebay that was made from a large many row planter. It works just great. I only have seed plates for seeds from corn to as small as milo. I am looking for seed plates for small seeds, like carrots, mustard greens, etc. Where can I get them? Any help would be appreciated. The plates are interchangeable with John Deere Lustran plates.